http://wolfgang-spahn.de/Installation_10_BilderEinerAusstellung.html

picture_of_an_exhibition_tec_rider.pdf

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Image:
http://daten.wolfgang-spahn.de/picture_of_an_exhibition_29aug2017.7z

user: pi
PW: raspberry
IP: 192.168.0.111

path to autostart:

/etc/rc.local

path to shutdownbutton script (pin 22):

/home/pi/pictures_of_an_exhibition/shutdownbutton_02.py

path to camera script:

/home/pi/pictures_of_an_exhibition/simple_camera.py

$ sudo mount / -o remount,rw

Check the current HDMI state:

$ tvservice -s

List of CEA supported modes:

$ tvservice –m CEA

List of DMT supported modes:

$ tvservice –m DMT

Choose the prefered mode, DMT work best with HDMI beamer and monitors.
CEA is hdmi_group=1
DMT is hdmi_group=2

Open config file:

$ sudo nano /boot/config.txt

change for example CEA 720p:

hdmi_group=1
hdmi_mode=4

Low level changes for DMT 640×480 60 Hz would be:

hdmi_group=2
hdmi_mode=4

All modes are on: http://elinux.org/RPiconfig
or here is some more information: http://embedded-artist.net/doku.php?id=hdmi_mode

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